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Cancer Chemotherapy and Pharmacology
Published in: Cancer Chemotherapy and Pharmacology 3/2016

01-09-2016 | Original Article

Multicenter phase II study of combination therapy with cetuximab and S-1 in patients with KRAS exon 2 wild-type unresectable colorectal cancer previously treated with irinotecan, oxaliplatin, and fluoropyrimidines (KSCC 0901 study)

Authors: Takao Takahashi, Yasunori Emi, Eiji Oki, Kazuma Kobayashi, Akihito Tsuji, Mototsugu Shimokawa, Takaho Tanaka, Yoshito Akagi, Yutaka Ogata, Hideo Baba, Kazuhiro Yoshida, Shoji Natsugoe, Yoshihiko Maehara, Kyushu Study Group of Clinical Cancer (KSCC)

Published in: Cancer Chemotherapy and Pharmacology | Issue 3/2016

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Abstract

Purpose

Anti-epidermal growth factor receptor antibody therapy alone or in combination with irinotecan is recognized as a standard third-line treatment for KRAS wild-type unresectable metastatic colorectal cancer. However, in some cases, it is difficult to administer irinotecan after third-line treatment. Therefore, we examined the efficacy and safety of the combination of cetuximab and S-1 in patients with KRAS wild-type unresectable metastatic colorectal cancer who were previously treated with irinotecan, oxaliplatin, and fluoropyrimidines.

Methods

The study was designed as a phase II, non-randomized, open-label, multicenter trial. Cetuximab was initially administered at 400 mg/m2, followed by weekly infusion at 250 mg/m2. S-1 was administered at a fixed dose of 80 mg/m2 orally twice daily for 28 days followed by a 14-day break, resulting in a 6-week treatment course. The primary endpoint was progression-free survival (PFS). The secondary endpoints were the overall response rate (ORR), overall survival (OS), disease control rate (DCR), time to treatment failure, dose intensity, safety, and BRAF mutation status.

Results

Thirty-seven patients were eligible. The median PFS was 5.5 months, the median OS was 13.5 months, the ORR was 29.7 %, and the DCR was 73.0 %. The relative dose intensity was 86.8 % for cetuximab and 88.1 % for S-1. Grade 3–4 adverse events that occurred in >10 % of the patient population included rash, dry skin, diarrhea, paronychia, anorexia, fatigue, mucositis, and neutropenia.

Conclusions

Combination therapy with cetuximab and S-1 was effective and well tolerated in patients with irinotecan-, oxaliplatin-, and fluoropyrimidine-refractory metastatic colorectal cancer.
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Metadata
Title
Multicenter phase II study of combination therapy with cetuximab and S-1 in patients with KRAS exon 2 wild-type unresectable colorectal cancer previously treated with irinotecan, oxaliplatin, and fluoropyrimidines (KSCC 0901 study)
Authors
Takao Takahashi
Yasunori Emi
Eiji Oki
Kazuma Kobayashi
Akihito Tsuji
Mototsugu Shimokawa
Takaho Tanaka
Yoshito Akagi
Yutaka Ogata
Hideo Baba
Kazuhiro Yoshida
Shoji Natsugoe
Yoshihiko Maehara
Kyushu Study Group of Clinical Cancer (KSCC)
Publication date
01-09-2016
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 3/2016
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-016-3109-4

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